What were the short coming of mendeleev's periodic table
Answers
What were the short
coming of Mendeleev's
periodic Table?
Mendeleev's Periodic Law
The Mendeleev's periodic law states that " The properties of periodic function depends on their atomic masses."
Shortcomings of Mendeleev's Periodic Table :-
Elements with large differences in properties were included in the same group. for example, hard metals like copper and silver were included along with soft metals like sodium and potassium.
No proper position could be given to the element hydrogen. In the periodic table, the location of hydrogen is uncertain. It was put with alkali metals within 1A class, but certain hydrogen properties are close to those of Halogen. So, it can also be put for halogens in the band.
The increasing order of atomic mass was not strictly followed throughout. For example in cobalt and nickel & Tellurium and Indium.
As isotopes are atoms of the same element having different atomic masses, they should have been given different positions while arranging them in the order of atomic mass. But this was not done.
In Mendeleev’s periodic table, this has not been done and the isotopes are placed next to their core element because they share similar properties.